ListBuffer.patchInPlace does not update last0 field, leaving the buffer in a corrupted state

[noresttherein]

Reproduction steps

Scala version: 2.13.10

    import collection.mutable.ListBuffer
    val buffer = ListBuffer(1)
    val patch = Seq(2)
    buffer.patchInPlace(1, patch, 2)
    println(buffer.last)

Problem

Prints 1

[noresttherein]

BTW, I found this through a static analysis of my improvement to ListBuffer, which I hope to make public on the days, and which fixes it in one sweep, so depending on how fast you need this one to be merged, you may not need to jump onto it this very moment.

[SethTisue]

@scala/collections

[NthPortal]

uh oh. I feel like I caused this